If I may say, messing around with dynamics is both fun & tedious!
I was actually struggling quite a bit yesterday with sparks but today I’m finally getting out some test render and I think they are somewhat getting there. With a little more tweaking I think they will fit in quite well with the shots. But only time will tell if we can get them out quick enough.
The other issue with sparks is that they weren’t actually looking like sparks. And trying to do this without reference was quite hard so this video helped quite a bit with the timing and colour.